TCA305 Datasheet, PDF (7/7 Pages) Siemens Semiconductor Group – Proximity Switch

TCA 305
TCA 355
L0, C0
RHy
RDi
D
RI; CI
CD
Resonant circuit
Hysteresis adjustment
Distance adjustment
Temperature compensation of the resonant circuit; possibly with series
resistance for the purpose of adjustment. The diode is not absolutely necessary.
Whether it is used or not depends on the temperature coefficient of the resonant
circuit.
Integration element. At pin 3 (integrating capacitance) we recommend a
capacitor of typ. 1 nF. To increase noise immunity this capacitor can be
substituted by an RC circuit with, e.g., RI = 1 M^Ω and CI = 10 nF.
Delay capacitor
Dimensioning Examples in Accordance with CENELEC Standard (flush)
Ferrite pot core
Number of turns
Cross section of wire
L0
C0 (STYROFLEX^®)
fOSC
Sn
RA (Metal)
CD
M 12
M 33 (7.35 × 3.6) mm
100
0.1 CuL
206 µH
1000 pF
appr. 350 kHz
4 mm
8.2 k^Ω + 330 ^Ω
100 nF
M 18
N 22 (14.4 × 7.5) mm
80
20 × 0.05
268 µH
1.2 nF
appr. 280 kHz
8 mm
33 k^Ω
100 nF
M 30
N 22 (25 × 8.9) mm
100
10 × 0.1
585 µH
3.3 nF
appr. 115 kHz
15 mm
22 k^Ω + 2.7 k^Ω
100 nF
Semiconductor Group
7